Mystery of Ageing of „Zero-Valent Iron“ (ZVI)

0475135 - ÚFCH JH 2018 RIV CZ eng C - Conference Paper (international conference)
Wouafo, M. T. - Donkeng Dazie, Joel - Tchatchueng, J. B. - Noubactep, Ch. - Ludvík, Jiří
Mystery of Ageing of „Zero-Valent Iron“ (ZVI).
XXXVII. Moderní elektrochemické metody. Sborník přednášek mezinárodní odborné konference. Ústí nad Labem: Best servis, 2017 - (Navrátil, T.; Fojta, M.; Schwarzová, K.), s. 261-265. ISBN 978-80-905221-5-2.
[Moderní elektrochemické metody /37./. Jetřichovice (CZ), 15.05.2017-19.05.2017]
Institutional support: RVO:61388955
Keywords : zero-valent iron * aging effect * zinc ion removal
OECD category: Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

So called „zero-valent iron“, (ZVI), is used for water treatment, or, more generally for
environmental remediation. In fact, the surface of the metallic iron powder in the presence of
water and oxygen cannot be considered as pure Fe0 but as a mixture of its corrosion products.
The remediation process occurs on the surface of these iron particles, hence, the degree of
„corrosion“ is crucial for the process itself. Therefore, investigation of „aging“ of ZVI is an
important prerequisite for deeper understanding of its activity.
In this work, the first results of the systematic study of aging of iron metal powder are
presented. The investigation was performed in batch conditions in aqueous buffered solutions
pH 4, 4.7, 5.5 and in the presence of air oxygen. Increasing and then decreasing concentration
of the Fe2+ ion in the solution appeared to be the important marker of aging process.
In the second part of the work, removal of Zn2+ ions using ZVI was investigated.
Electrochemical techniques, namely polarography and its differential pulse form (DPP) were
used for permanent monitoring of the presence of Fe2+ and Zn2+ ions in the studied solution.
Changing concentrations of both ions revealed that at pH 5.5 the optimum aging time of ZVI
for removal of Zn2+ from aqueous solution is 6 hours.
Permanent Link: http://hdl.handle.net/11104/0271990